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what is the significance of pressure angle in spur gear?
What is meant by self locking in worm and worm gear?
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Answer Posted / latha nagendran
*Pressure angle is the angle at which the driving gear
applies the normal force on the driven gear.The tangential
component of this normal force (Fncos(alpha))is what
contributes to the torque transmission and the radial
component(Fnsin(alpha)) only loads the shaft. Higher the
pressure angle lower the component that contributes to torque.
* Normally the driving member in a worm gear drive is the
worm. That is, it is used for speed reduction. The wheel
does not drive the worm. Motion is from worm to wheel.Hence
it is termed as self locking. It is a safety feature as in
cases of sudden power failure, the load being lifted will
not fall down as in the case of a hoist.However the wheel,
under certain conditions of lead angle,can drive the worm
worm gears become reversible.
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